CORD-19:013ce450f63ae2496b92f987e35b55125a43947f / 1254-1455 JSONTXT

{"project":"Epistemic_Statements","denotations":[{"id":"T3","span":{"begin":0,"end":201},"obj":"Epistemic_statement"}],"text":"or new and novel delivery systems (liposomes, live recombinant vectors, microspheres, DNA plasmids, virus-like particles) requires further investigation, and specific examples are given in this review."}